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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9d270a7e8cb3ef420be63257b962e23b26a0421cb507bfc4d9f01643ab7fed' 
  AND token = '9AKZ0H6h0h7Z9qyN/T6pVI3uRI76i8o873c4FcRScRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}